I was talking about this with someone the other day - my IQ skews higher than it probably should do, because (relative to my other abilities) I'm pretty good at sequences, patterns, problems and simple (as in small) questions, whereas hers was lower than would be expected as she wasn't so good at those (again, relative to her other talents, such as creativity and complex ideas).

I gues it's pretty obvious, but the urbanised city states are always going to do better in an IQ test as they deal with the kind of problems encountered more frequently than people who live a more rural/arable lifestyle. Doesn't make em more stupid or wotnot.